<template>
  <div class="login_container">
      <!-- 登录界面 -->
      <div class="login_box">
          <!-- 头像区域 -->
          <div class="avater_box">
              <img src="../assets/logo.png" alt="">
          </div>
          <!-- 登录表单区域 -->
          <el-form ref="loginFormRef" :rules="loginFormRules" :model="loginForm" label-width="0px" class="login_form">
            <!-- 用户名 -->
            <el-form-item prop="username">
                <el-input type="text" v-model="loginForm.username" prefix-icon="el-icon-user" placeholder="请输入用户名 默认:admin"></el-input>
            </el-form-item>
            <!-- 密码 -->
            <el-form-item prop="password">
                <el-input type="password" v-model="loginForm.password" prefix-icon="el-icon-lock" placeholder="请输入密码 默认:123456"></el-input>
            </el-form-item>
            <!-- 按钮区域 -->
            <el-form-item class="btns">
                <el-button @click="login" type="primary">登录</el-button>
                <el-button @click="resetLoginForm" type="info">重置</el-button>
            </el-form-item>
          </el-form>
      </div>
  </div>
</template>

<script>
export default {
    name:'Login',
    data() {
        return {
            //登录表单的数据
            loginForm:{
                username:'',
                password:'',
            },
            //表单校验规则
            loginFormRules:{
                username:[
                    {required:'true',message:'请输入登录账户名',trigger:'blur'},
                    {min:3,max:10,message:'长度在3到10个字符之间',trigger:'blur'}
                ],
                password:[
                    {required:'true',message:'请输入登录密码',trigger:'blur'},
                    {min:6,max:15,message:'长度在6到15个字符之间',trigger:'blur'}
                ],

            }
        }
    },
    methods:{
        //点击重置按钮重置，登录表单
        resetLoginForm(){
            this.$refs.loginFormRef.resetFields()
        },
        //点击登录验证账号密码
        login(){
            this.$refs.loginFormRef.validate(async valid => {
                if(!valid) return;
                const {data:res} = await this.$http.post('login',this.loginForm)
                if (res.meta.status !== 200) return this.$message.error('登录失败了！');
                this.$message.success('登录成功了！');
                //登录成功后，将token保存到sessionStorage
                window.sessionStorage.setItem('token',res.data.token);
                //通过编程式导航跳转到后台主页，/home
                this.$router.push('/home')
            })
        }
    }
}
</script>

<style scoped>
    .login_container{
        background-color: #2b4b6b;
        height: 100%;
    }
    .login_box{
        width: 450px;
        height: 300px;
        background-color: #fff;
        border-radius: 15px;
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%,-50%);
    }
    .avater_box{
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px rgb(95, 95, 95);
        position: absolute;
        left: 50%;
        transform: translate(-50%,-50%);
        background-color: #fff;
    }
    .avater_box img{
            width: 100%;
            height:100%;
            border-radius: 50%;
            background-color: #eee;
        }
    .btns{
        display: flex;
        justify-content: flex-end;
    }
    .login_form{
        position: absolute;
        bottom: 0px;
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;
    }
</style>